That was very good. Almost makes me wonder if the guy in the audience was a plant. I'm only going by how well-played it was and Carr's response.
Although, from my years spent around comics and other performers, I know for a fact that many of them have planned responses for some situations that commonly arise - basically a "rehearsed ad lib." Carr's delivery was smooth enough to convince me that he's used it before.
If this whole routine wasn't staged, Carr's response was at least on the back burner for just such an occasion.